For my purposes, this bench is fine as planned. I have several presses that I move in and out of location. With extra wood bracing the c-clamps it will be fine. I have enough extra plywood to lay two more layers on top if needed.

I paint mine with clear polyurethane, Minwax probably, two or three coats.

Something else to consider is a piece of half round nailed to the top around the perimeter to help keep stuff from rolling off. Run it right around the base of the presss. Even a little 1/2 inch half round makes a difference.